Artifact analysis of approximate helical cone-beam CT reconstruction algorithms
| Autor: | Th. Kohler, Roland Proksa, Claas Bontus, Michael Grass, Jan Timmer |
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| Rok vydání: | 2001 |
| Předmět: |
Artifact (error)
Cone beam computed tomography Models Statistical medicine.diagnostic_test Computer science X-Rays Computed tomography Image processing General Medicine Iterative reconstruction Aliasing Image Processing Computer-Assisted medicine Medical imaging Humans Tomography Computed radiography Image sensor Tomography X-Ray Computed Algorithm Image resolution Algorithms Ct reconstruction Cone beam reconstruction |
| Zdroj: | Medical Physics. 29:51-64 |
| ISSN: | 0094-2405 |
| DOI: | 10.1118/1.1413518 |
| Popis: | In this paper, four approximate cone-beam CT reconstruction algorithms are compared: Advanced single slice rebinning (ASSR) as a representative of algorithms employing a two dimensional approximation, PI, PI-SLANT, and 3-PI which all use a proper three dimensional back-projection. A detailed analysis of the image artifacts produced by these techniques shows that aliasing in the z-direction is the predominant source of artifacts for a 16-row scanner with 1.25 mm nominal slice thickness. For a detector with isotropic resolution of 0.5 mm, we found that ASSR and PI produce different kinds of artifacts which are almost at the same level, while PI-SLANT produces none of these artifacts. It is shown that the use of redundant data in the 3-PI method suppresses aliasing artifacts efficiently for both scanners. |
| Databáze: | OpenAIRE |
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